Shuttle for sewing-machines



(No Model.)

T. CROSBY. v v.SHI'IITLE'FOR SEWING MACHINES.-

-No.572,335. a I PateritedD-ec. 1,1896.

mizwsses: I I

UNITED STATES PATENT OFFICE.

I'IANFORD T. CROSBY, OF BOSTON, MASSACHUSETTS, ASSIGNOR TO THE BERTRANDSEIVING MACHINE COMPANY, OF PORTLAND, MAINE.

. SHUTTLE FOR SEWING-MACHINES.

SPECIFICATION forming part of Letters Patent No. 572,335, dated December1, 1896.

' Application fil d March 14,1896. Serial No. 583,240. (No model.) I

, is a specification.

My invention relates to shuttletension devices, and is designedespecially for rotary shuttles for wax thread sewing machines; and itconsists in certain novel features of construction, arrangement, andcombination of parts, which will be readily understood by reference tothe description of the accompanying drawings and to the claims heretoappended and in which my invention is clearly pointed out.

Figure 1 of the drawings is a front elevation of a wax-threadsewing-machine shuttle with my improved tension device applied thereto.Fig. 2 is an edge view of the same. Fig. 3 is a partial section on linea; m on Fig. 1. Figs. 4 and 5 are respectively an inverted plan and anedge view of the tension-spring. Fig. 6 is a perspective view of thebobbin-retaining plate, and Figs. 7 and 8 are respectively a sectionalelevation of the bobbin-stud and a plan of said stud with clamping-screwremoved.

In the drawings, A is the shuttle-body, provided with a chamber toreceive the bobbin B, which is mounted upon and revoluble about a fixedstud or journal a, set in the shuttle-body with its axis coinciding withthe axis of said chamber and having a small section of its length at itsouter or front end made flat-sided, as shown in Figs. 7 and 8.

O is a plate having an open-ended slot 1) formed in one end thereof,adapted to receive the flattened portion of the stud a, and c is aclamping-screw fitted to a threaded hole in the end of the stud a andhaving a head of a diameter not greater than the diameter of said stud,but adapted to bear upon the plate 0 at either side of the slotb toclamp said plate to the stud a, so as to retain the bobbin upon saidstud and at the same time allow it to revolve freely thereon.

The plate 0 is provided at its end opposite to the slot 1) with theoutwardly-projecting ear d, in which is formed the thread-guiding eyecl.

The shuttle-body A has formed therein the thread guiding or deliveringopening 6, near the root of the hook A and communicating with theinterior of the bobbin-chamber between the flanges of said bobbin.

D is a tension-spring provided on its inner face with an annular lip dsurrounding the screw-hole f, through which the screw 9 is screwed intothe shuttle-body to clamp said spring firmly thereto, and h is a screwpassing through said spring and threaded into the shuttle-body as ameans of adjusting the movable end of said spring to a greater or lessdistance from the body of the shuttle to regulate the tension of saidspring upon the thread 2', as shown in Figs. 1, 2, and 3.

A hook E is set in or secured to the shuttle-body near the root of thehook A, and a similar hook F is secured to said shuttle at the oppositeend of the spring D, as shown in Figs. 1 and 2. The shuttle-threadpasses from the bobbin B through the'opening e, under the end. of thespring D, under the head of the hook E, under the outer edge of thespring D, under the head of the hook F, and thence through the eye d ofthe plate 0, as shown in Figs. 1 and 2.

To remove the bobbin for refitting the same, it is only necessary toslacken the screw 0 and withdraw the plate 0 from beneath it, when thebobbin may be removed from its supporting-stud a and be replaced thereonand again secured in position by inserting the slotted end of the plate0 beneath the head of the screwc and tightening said screw thereon. Thisarrangement of the several parts of the shuttle,its bobbin, and thethread- 0 threadde1ivering opening through the peripheral Wall of saidchamber; a leaf-spring secured to the front face of the shuttlebody andhaving its contact-surface with the front face of said shuttle-bodyparallel to the plane of revolution of said shuttle; a pair ofthread-guiding hooks set in said front face of the shuttle-body, one ator near each end of said spring; and the plate 0 provided with thethread-guiding eye 01, cl.

2. The combination With a rotary shuttlecase provided With abobbin-chamber and With the thread-delivery opening 6 and abobbin-carrying stud set therein of a bobbinretaining plate secured in afixed position on said stud and provided With a thread-guiding eye at ornear the axis of the shuttle-body;

the spring D; the clamping-screw g; the adjusting-screw 72/; and thehooks E and F.

3. The combination of the shuttle A provided With the stud a, and thedelivery-opening 6; the bobbin B; the spring D provided with the annularlip d the clamping-screw g; the adj Listing-screw h; and the hooks E andF.

I11 testimony whereof I have signed 'my name to this specification, inthe presence of two subscribing Witnesses, on this 12th day of March, A.D. 1896.

HANFORD T. CROSBY.

\Vitnesses:

N. G. LOMBARD, F. O. HALL.

